Question

8. If (x^2+1/x^2)=79, then find the value of x+1/x
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Answer 1

(X+1/X)^2=79

(X+1/X) ^2=79+2

(X+1/X) ^2=81

=X+1/X=√81

=X+1/X=9 ANS.

(X+1/X) ^2= VALUE -2

(X-1/X) ^2=VALUE+2